The 615-page survey found that more than 100,000 British Muslims sympathize with suicide bombers and people who commit other terrorist acts. Moreover, only one in three British Muslims (34%) would contact the police if they believed that somebody close to them had become involved with jihadists.

"[W]e have to adopt a far more muscular approach to integration than ever, replacing the failed policy of multiculturalism... Britain's liberal Muslims are crying out for this challenge to be confronted. ... There is a life-and-death struggle for the soul of British Islam -- and this is not a battle that the rest of us can afford to sit out. We need to take sides... We have 'understood' too much, and challenged too little -- and in doing so are in danger of sacrificing a generation of young British people to values that are antithetical to the beliefs of most of us, including many Muslims." — Trevor Phillips, former head of Britain's Equality and Human Rights Commission.

The survey does show that 88% of British Muslims believe Britain is a good place for Muslims to live. According to Philips, this is because the tolerance they enjoy in Britain allows them to do whatever they want.

Many British Muslims do not share the values of their non-Muslim compatriots, and say they want to lead separate lives under Islamic Sharia law, according to the findings of a new survey.

The poll — which shows that a significant part of the British Muslim community is becoming a separate "nation within a nation" — has reignited the long-running debate about the failure of 30 years of British multiculturalism and the need for stronger measures to promote Muslim integration.

The survey was conducted by ICM Research for the Channel 4 documentary, "What British Muslims Really Think," which aired on April 13.

The 615-page survey found that more than 100,000 British Muslims sympathize with suicide bombers and people who commit other terrorist acts. Moreover, only one in three British Muslims (34%) would contact the police if they believed that somebody close to them had become involved with jihadists.

In addition, 23% of British Muslims said Islamic Sharia law should replace British law in areas with large Muslim populations.

On social issues, 52% of the Muslims surveyed said they believe homosexuality should be illegal, compared to 22% of non-Muslim Britons. Nearly half believe it is unacceptable for a gay or lesbian to teach their children. At the same time, almost a third (31%) of British Muslims think polygamy should be legalized. Among 18-to-24-year-olds, 35% think it is acceptable to have more than one wife.